Effect of strain rate on plastic deformation bonding behavior of Ni-based superalloys
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第5期
论文作者：Jian Yang Zhang Bin Xu Naeem ul Haq Tariq Ming Yue Sun Dian Zhong Li Yi Yi Li
文章页码：54 - 63
摘 要：Plastic deformation bonding（PDB） has emerged as a promising solid state bonding technique with limited risk of phase transformations and residual thermal stresses in the joint. In this study, the PDB behavior of IN718 superalloy was systematically investigated by performing a series of isothermal compression tests at various processing conditions. It was revealed that, with increasing PDB strain rate at 1000?C, different extents of dynamic recrystallization（DRX） occur in the bonding area of IN718 joints. The extent of DRX,average size of DRXed grains, and a newly proposed "interfacial bonding ratio（?Bonding）" parameter（to quantify the bond quality） were initially reduced with increase in the strain rate up to 0.1 s-1 and later increased at further higher strain rates. Electron backscattered diffraction（EBSD） and transmission electron microscopy（TEM） based interfacial microstructure analyses indicated that the quality of the bonded joints is closely related with the development of fine DRXed grains at the bonding interface with the increasing strain, which promotes adiabatic temperature rise. It was revealed that the initial bulging and subsequent migration of the original interfacial grain boundary（IGB） were the main mechanisms promoting DRX in the well bonded IN718 superalloy joints. Moreover, the mechanical properties of the bonded joints were not only controlled by the recrystallized microstructure but also depended upon the Bonding parameter of the joints.
Jian Yang Zhang1,2,3，Bin Xu1,3，Naeem ul Haq Tariq4，Ming Yue Sun3，Dian Zhong Li3，Yi Yi Li1,3
1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences2. School of Materials Science and Engineering, University of Science and Technology of China3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences4. Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences
摘 要：Plastic deformation bonding（PDB） has emerged as a promising solid state bonding technique with limited risk of phase transformations and residual thermal stresses in the joint. In this study, the PDB behavior of IN718 superalloy was systematically investigated by performing a series of isothermal compression tests at various processing conditions. It was revealed that, with increasing PDB strain rate at 1000?C, different extents of dynamic recrystallization（DRX） occur in the bonding area of IN718 joints. The extent of DRX,average size of DRXed grains, and a newly proposed "interfacial bonding ratio（?Bonding）" parameter（to quantify the bond quality） were initially reduced with increase in the strain rate up to 0.1 s-1 and later increased at further higher strain rates. Electron backscattered diffraction（EBSD） and transmission electron microscopy（TEM） based interfacial microstructure analyses indicated that the quality of the bonded joints is closely related with the development of fine DRXed grains at the bonding interface with the increasing strain, which promotes adiabatic temperature rise. It was revealed that the initial bulging and subsequent migration of the original interfacial grain boundary（IGB） were the main mechanisms promoting DRX in the well bonded IN718 superalloy joints. Moreover, the mechanical properties of the bonded joints were not only controlled by the recrystallized microstructure but also depended upon the Bonding parameter of the joints.
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